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Bonds lengths are measured in angstroms, the stronger the bond, the shorter the lengths. The length will be given to us I believe, as was the case in Wednesday's lecture when the Dr. Lavelle stated in a slide "Observed N--O bond length in (NO3)- = 1.24 Angstroms. "
I believe he said in our lecture on Friday that we don't need to know how to find the bond lengths in this class, just that double bonds are shorter than single bonds between the same two elements, and bonds in resonant structures are between those two lengths.
In general, we just need to know that double bonds and triple bonds are shorter than single bonds. Because the forces of double bonds and triple bonds are stronger as a result of more electrons atoms will be pulled closer together leading to shorter bond lengths. Overall, I think you wouldn't need to know the exact bond length just the relationship between double bonds and single bonds and the reasoning behind it.
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